SAGACIOUS Copy link • SAGACIOUSsagax (often with ad aliquid; e.g., ad haec pericula perspicienda, Planc. ap. Cic.): acutus: acer: subtilis: argutus: perspicax: plenus rationis et consilii (Cic.). Very sagacious, peracutus: peracer [SYN. in ACUTE]: a sagacious mind, sagax ac bona mens (Cic.).